Means of fixing cutters in milling and cutting heads.



N0. 833,270. PATENTED OCT. 16, 1906. W. WEMHOENER.

MEANS OF FIXING GUTTERS IN MILLING AND CUTTING HEADS. APPLIOA'IION FILED JUNE 29, 1905.

UNITED STATES PATENT OFFICE.

WILHELM WEMHOENER, OF DORTMUND, GERMANY.

' MEANS OF FIXING CUTTERS IN MILLING AND CUTTING HEADS.

Patented Oct. 16, 1906.

Application filed June 29, 1905. Serial No. 267.665.

To all whom it may concern:

Be it known that I, WILHELM WEMHOENER, merchant, a subject of the King of Prussia,

. German Emperor, residing at 15 Schwanencombined-that is to say, screw-cotters are employed. The cutter-heads formed in this manner may comprise cutter-b ars which tap er off dovetail fashion and are fixed by a cotter lying in the hollow stock of the head by means of a screw. Further, it is no longer novel to employ screws with conical shank or head for clamping the cutters. When this means is resorted to, behind each cutter one or more of these screw-cotters is let into the-body of the cutter-head, so that the back of the cutter bears tightly against the peripheral face of the shank or the head of the screw which is directed toward it. This arrangement, however, presents the defect that the specific superficial pressure upon the screw is excessive, and large efforts cannot be transmitted by this means. Cutter-heads constructed in this manner are not suited for cutting coarse shavings.

The present invention has for its object to obviate these defects.

The characteristic feature of the invention is that the clamping action is obtained by means of slotted clamping-sockets formed with a flat and which are adapted to be ex panded by means of conical screw-bolts situated inside the sockets, so that they bear against one side of the wedge-shaped cutterfoot, which they thereby clamp.

In the accompanying drawings, Figure 1 is a side elevation, partly in section, of the cutter-head. Fig. 2 is a plan view. Fig. 3 is an elevation of the socket with wedge-shaped bolt. Fig. 4 is a plan view of the socket, and Fig. 5 is a central section of the socket through the slot.

Similar letters refer to similar parts throughout the several views.

In the cutter-head a, on the rear side of which the plate I) is fixed by means of countersunk screw-bolts g, dovetail grooves are formed for the reception of the cutters e, which fit snugly within them. In front of each groove there are bored in an axial direction one or more holes for the reception of the spring clamping-sockets 0, according to requirements. These sockets c, as shown in Figs. 1, 3, and 5, are conically recessed and are provided with a slot it. They are also formed with a flat 1c. The socket c is inserted in the cutter-head a in correspondence with the tapering of the cutter in such a manner that the slot is directed toward the periphery of the cutter-plate, While the flat comes in contact withthe cutter e. When this has been done, the countersunk screw-bolts f, Figs. 1, 2, and 3, are screwed in so as to secure the sockets and prevent their coming out, which might happen when changing the cutters. The conical screw-bolts d are then inserted and tightened up. By tightening the nuts of the conical screw-bolts d the slotted socket c is expanded, its flattened sidebeing thereby pressed tightly against the wedgeshaped cutter-bar e, which is thus firmly secured.

The flat is on the socket 0 serves as a pressure-face, and as the cutter is supported both atits back and its bottom the fastening will withstand the greatest strains itself and enable the cutter-head to do the same.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination, in means for fixing the cutter-bars of milling and cutting heads with a body and a cutter have a dovetail-shaped foot, of conical screw-bolts, nuts thereon adapted to be tightened, and expansible slotted sockets surrounding the bolts and having a fiat face against which bears one side of the cutter.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILHELM WEMHOENER.

Witnesses OTTO KoNIG, HERMANN ScHRoDER. 

